And abraham



July 7, 1925.

E. L. CHRiSTENSEN ET AL PHOTDGRAPHIC CAMERA 3 Sheets-Sheet 2 Filed Feb. 1922 2 J3 Zeko $3 a fwv Gun/um July 7, 1925.

E. L. CHRISTENSEN ET AL PHOTOGRAPHIC CAMERA Filed Feb. 4. 1922 3 Sheets+Sheet 5 Ition, to the Patented July 7, 1925.

UNITED s'rarss PATENT caries.

EDWARD L. CHRISTENSEN AND JESSE" H. HAND, or DETROIT, MICEIGAN, assrcnons or ONE-HALF r0 HARRY r. CHRISTENSEN, or CHICAGO. rumors, AND ABaAnam A. ROCHLIN, 0F DETROIT, MICHIGAN.

PHOTOGRAPHIC CAMERA.

Application filed February 4, 1922. Serial No. 534.186.

To all whom it may concern; v V

Be it known that we, EDWARD L. CHRISTEN- si N and Jesse H.- .HAND, citizens of the United States, residing at Detroit, county of lVayne, State, of 'Michi'gan, have invented a certain'new and useful Improvement in Pho- 1 ,An object of our invention; is .to provide a simple,-inexpensive mechanism adapted to r be easily applied to anyxof the standard cameras either of the folding,,or.box, type capable of automatically locking the shutter mechanism after each exposure operation,

whetherbulb, time or instantaneous against a subsequent exposure operation, :Withoutfirst shifting the film so as to removethe exposed portion of the film and substitute in back of the lens an unexposed section of film.

Amateur users of the camera have particularly felt the need of a suitable simple mechanism for the prevention of double exposure. Not only is the waste of film considerable, due to double exposure, or its reverse, which is the result of over caution, that is of removing an unused section of film from in back of the lens .and substituting the succeeding unused section in place thereof; but what is a greater loss from the photographers point of View is the lossof photographs which may be .difiicult, ifiiot impossible, to again secure.

vided with a manually-operable shutter lever or trigger. It is obvious that the improve ments would fit equally well on a camera provided with the well-knownpneumatic type of shutter lever operation. It is likewise apparent that it could be adapted, withoutdeparting) from the spirit of the invenox type of camera. A nieces sary adjunct is the roll type of film opera! tion, but the film is today in universal use on hand cameras. I r;

The above, and other objects, 5 together with the method of operation and "detailsof construction, though of course itz-is understood that we do not intend to confine our more fully appear from the following; (16-- invention to the exact structure shown, will seriptio i, appended claims andaccompaiiyiiig drawings, inwhich:

..Figure l is aside elevation ofan opencamera with our, invention applied thereto. Fig. 2 is a sectional view showing-the cam socketend of thefilm roll with =one side of the casing removed.

. '1 r Fig. 3 isja cross-sectional View taken .on-*

4 2,. .70 Fig. 4 IS, a cross-sectionalwiew takenon.

line 3 3, Fig. 2.,

the line ls-4:, Fig.3.

Fig. 5 is a front eelevational view lshowing the shutter mechanism casing and lens plate support.

Fig. 6 is a perspective of the endsocket cam which is pivoted to the casing. at one end of the film roll.

Fig. 7 is a perspective of the of the socket. shown in Fig.6. Y

Fig. 8 is a fragmentary view taken on the line 88, Fig. 5, showing the shutter mechanism ready for operation.

Fig. 9 is a view taken on the same line. as Fig. 8, showing the shutter mechanism locked against operation.

Fig. 10 is a sectional view through the head of the flexible shaft showing the pjlunger mechanism.

.Fig. 11 is a sectionalview taken on vthe line 1111, Fig. .10.

Fig. 12 is a fragmentary view of the shutter casing with.tlie outer spring face plate removed, showing the We have shown our improvement as ap-- plied to a camera of the bellows type -pro--- shutter lever-in the normal position.

Fig. 13 is a View taken on the same line as that in Fig. '12, showing the shutter lever reverse side front elevationalfolding photographic camera of the bellows type in which the casing is indicated as 20, the front-hoardis-adapted to drop down aiid serve asa support fo i' the" lensplate when in the advance position as shown in Rig. l is indicatedas 21 andthe film roll as 22 The rolliviridinglrey-is iridicate'd 23. We have not shown or described the shutter mechanism as it is of standard construction and forms .no part of our invention. The only part of the shutter mechanism which we have shown ,is the shutter lever or trigger mechanism which is commonly diflectly pactii'ated by the hand of the operator; th'ougli -it' may be manually actuated by pneumatic mechanism whiehwen struction is a common practice.

In sta-Iidard camera construction scam:

plet-e' reciprocal= movement of thisshutter lever or'reciproc'atin'g trigger is involved m *ea'chmovement; of the shutter to esp-est mafilnfi-- and'-'th'e return of the shutter ieveriw' agaim engage bhe shad s-mechanism fer asubsequent exposure opeiition. This r'fiech a-nisln iswell kncwnfanelwe havemaae use of it: as thietio'.

'10 positively assure removalof the ex; posed section of film-hem in back of the shutter mechanism to expose the-film,"itfiis necessary that: the 'lbki'mg'" means" pioaaea for such shutter mechanisn'i 'lie operatively connected with theffilin' roll so't'halt the shuttar may be releasedforope'rativ movement when an unused section of film ha'ben m'oved 'irite'; osition atzthfdrea -r of the we. However, t'oaccommodate my invention to the already provided filnv'fbll, prevent increased cost of this artic'le5'tv have 'p'rIO- videcl our film r'o'll' operating I'n'emberin the form ofa cam disc or end so'ckt adapt-ea to perfonn a" cam-action whichsocliet or: is

carried by the camera casing. I

Our revolving disc orcam member 24 is ecce'iitrically ivote'd' on an end-supporting member 25, which member 25 is seeurd'td the casing by he desired;

means of's'ci'ews 26, or as may This end member is provided with an axial extension which eiz tend's through the czis'ing and is received within a recess 27 formed'in one face of the cam so to serve as aslipporting'be'ariiig' flit-the rotation 6f the cam. On the reverse face of the disk-opposite its axis of'support is a projecting-- teat 128 provided with one '01- more wingsai; which test; is adapted: to impinge the eha'oi the film roll so the cam will rotate as piece with the-roll. In common construction tli'ese film rolls'are made of wood aiid the member 28 may be easily detachably engaged there with; as sh'o-wn'inFig'. 3. w

Theform of teat construction shown is a= convenient 1 means of releast ibly engalgfing it exists; applying our" iiapievemsm" the roll when it is inserted for rotation within the casing. It is obvious that the cam 24 might; be-diflerently constructed and yet so mounhed as'to produce' a'cain action upon its rotation. This cam acting disk is held in place by means of a pin 31 which secures 1t to'th'e eiid supporting member 25.

A t the opposite ofthefilm roll, as the roll is in position in the casing, there is secured-tothe inner side of the camera casing a flat spring 32 which is adapted to engage the endof the roll"fiwn'ge as the roll is positioned within the casing. This spring exerts end thrust on the'rtfll to'force the same into engagement with the teat onthe cam disk to pfi'cli up the for-rotation with the roll. spring 32'is'perforated at 33 to permit eir'ten'sion 'therethroughidfthe end 33 of the wiil" in'g key 23; "iv&in end of the winding key engages aprov'ided"kerf in the end of as filniroll t a premise-means aim-00f.

7 By inans'h'f this' 'spriliig' the film roll may be easily positioned within or removed from the camera, c'ajsinig' iv 1 This maybe ma d'e of slightly" iesilieiit'm'etttl s6 as to exert a yielding end thrust on the film rol'l it desired.

A Q's-meta of-thiitjrpeiof constructionis usually provided with ,a" transversely e5:- tending partition 35"s5paiiiiting thefilin roll cdnipartnf ht" 'ff'bih the lo'ivr compartment intowhiclithe bellows afidlehs and shutter mebliz'rifisfn fold wl fefithe cafiii'era is closecl'.

' We provide fieit'ible' shit-636 fliaviiig a bearin shoe" 37fwhich 'is held yieldingly against" the of the eccentricall pivoted cami2'4 'means'i'of spring 38. The shaft is with-a flex'ible'casing 39- which is secured at the shoe end to the partition 35,asshown in" Fig. 2;, so as to he'd the shoe yieldingly against the re\'( l\' i At the'opposite mid the flexible casing' is sitii-ell'ed to aplu'nger housing 40 as shown in Fig. 101 Thislio usixig is'formed in opp'dsed complementary sections secured toget ier by means of screw bolt 41. The h'o usin' 'inay secured to the lens plate 42 so as to e' supported thereby as shown at 43.

The shaft itself is provided with an angu- IaFwedQe-sTiaped head 44;- the sloping face 45 of which, engages in a slot 46 in the plunger 47 to reciprocate the plunger andwis'e' as the head israi s'ed or lowered. The plunger and thehead'are showni'n the withdrawn and lowered positions respectively in full-'linein Fig. and theprojected and upra'ise'd' pds'iti'ons'i'espectively in the dotted line's.

Fig; 14; Wef h ave 'show'n the plunger as a difectlcbiitinuatioii of theflexible shaft and adapted. be directly through camera casing with a less acute bend in theflexible shaft than is possible with-the formof attachment. shown in Fig. 14.

It will beseen, therefore, that, due to the eccentric mounting of the cam disk and its engagement with the film roll for rotation, wit-hevery complete rotation of the. film roll the plunger 47- will ,be projected and withdrawn, thereby completing one recipro cal movement. L

The. shutter lever, or hand trigger, is indicated as 49, and for each completegreciprocal movement thereof the film'is exposed and the shutter lever automatically returned-t0 the starting position from .which the shutter mechanism may -again be actuated to expose the film. i In time exposures-requiring repetitive actuation of the shutter, the Shutter lever does not returntothe initialstarting position until after. ;it has been actuatedthe second time. It is necessary, therefore, to place the shutter mechanism in positionfor a. second .eaposure that the first exposure operationbe completed and-the shutter lever returned to gthe.star .ting positiona e have providedfa face plate 50 of spring metal. adaptedto .be;.superimposed -on the face plate. oflthe, shutter. housing and held in position by meansof screws 51. I This resilient -fee p eee rie e:. y-P 9i ting .-stop,{o1-; pin, i 52 so disposed with- .respect tothe shutterlever 4: 9-as to engage in the rear thereof when the shutter lever. is depressed preventing areturn .of the shutter lever tothe starting position. The constructionand mountingof-.the.face plate 50. is such that; the stop 52 is-held yieldingly inwardsagainsttheflat side of the. Lshutter lever when the lever is in the normal position, as shown in Fig.8;- -When the shutter' lever is depressed the spring tension of the face plate 50.forces the stop into position in the rear thereof so as to prevent the return ofthe lever to thenormal starting position, at which time the parts assume the position indicated in Fig. 9. 1

When the stop is in the position shown in Fig. -9,- preventing the complete return of.

the shutter lever 49, the shutter lever has not returned sufiiciently to permit a second operation of-the shutter mechanism although the shutter levermay be reciprocated freely as limitedby the stop. 2 There can, therefore,

be no action of the shutter mechanism to produce exposure of the film. .The pin or stop 52 must .be first withdrawn to permit the shutter lever to complete .its reciprocal m vement before the shutter mechanism may ag-ainbe operated to. produce exposure-of thefilm.-

We provide means operable by the recip rocal action of the plunger 47 to retract this stop 52. All that is necessary to retractthe stop 52 would be to force the spring plate 50 outwardly by the action of the plunger operated through therota-tio'n of the film roll. Therefore, were the camera so constructed that the amount of rotation necessary to bring .a picture film in then-ear. of

the lens was in each instance the same, all

that would be necessary .would be to provide means adapted to reciprocate the plunger once for each such period of r0tation.'

or projected position,.whenever the shutter lever is operated the stop 52 will automatically engage the lever to preventits return to the starting position and. also that .further rotation of the fihn roll to bring an unused section of film into position the rear of the lens will retract the stop torelease the shutter lever.

A swinging plate 53 is freely pivotally mounted on the stop .52 so as toswing ina;

small are from such pivot in and out of the path of the plunger 47. This plate 53 is held: yieldingly outwards by means of a spring 54 secured to the face plate of tl1e;2shutter housing, as shown in .Figs. .12. nd 13.;1 In

Fig. 12 it. is shown inthe normal position held outwardly in the'pat-h of the plunger 47 so as to engage the plunger when @it is projected forward. In this position the plate 53 will be forcedoutwardly in -front.

of the advancing. plunger .and asthis plate is pivoted directly. in therea-r'gof the-spring face plate 50 it will forcethis,fa'ceplatev outwardly and retract therstop 52 .to .release the shutter le 'erto'returnato :its starting position. The mechanism is shown in this position in Figs. 8 and 12. In 'Fig. 8, the shutter ley er has assumed the normal position and the stop. 52 bears against a fiat face of such shutter lever. As the film is exposed by the depression" of the shutter lever, the turned-over thumb grip of the lever engages the edge of the swinging plate 53, as shown in Fig. 13, and forces the swinging plate inwardly against the tension of spring 54;, removing the projecting portion of the plate from the path of the-plunger to .permit thespring 50 to return to its tion of the shutter to expose the mull- T0 loo lltl

each shutter exposure operation to prevent the return of the shutter lever to the starting position, means operable upon rotation of the film roll to release the shutter-engaging lever mechanism to permit return of the shutter lever to the starting position, and means responsive to the actuation of the shutter lever to place the spring-controlled member into position to engage the same after an operation of the shutter lever.

6. In a camera having a rotatably mounted film roll, operable shutter mechanism mounted Within a casing having a face plate, and a reciprocating shutter operating member, a spring metal face plate secured to the aforesaid face plate provided with means for automatically locking said shutter operating member after each exposure operation to prevent subsequent operation thereof, and means controlled by the rotation of the film roll for releasing said looking means.

. In a camera provided with a rotatably mounted film roll, shutter mechanism disposed Within a casing, a spring face plate carried by the casing, means controlled by said face plate operable to lock the shutter mechanism after each operation against a succeeding operation, and means controlled by the film roll to release the shut-ter mechanism for operation.

8. In a camera provided with a rotatably mounted film roll, shutter mechanism dis posed Within a casing, a spring face plate having a part operable to lock the shutter mechanism after each operation against a succeeding operation, means controlled by the film roll operable to release the shutter mechanism for operation, and means responsive to shutter operation to control the movement of the face plate to control the operation of the shutter mechanism.

In testimony whereof, We sign this specification.

EDWARD L. OHRISTEN SEN. JESSE H. HAND. 

